Proceedings of the Korean Institute of Surface Engineering Conference (한국표면공학회:학술대회논문집)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of laser heat-treatment on microstructure and micro-hardness of HVOF-sprayed WC-CoCr coating

  • Zhang, Shi-Hong (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Cho, Tong-Yul (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Yoon, Jae-Hong (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Fang, Wei (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Joo, Yun-Kon (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Song, Ki-Oh (School of Nano & Advanced Materials Engineering, Changwon National University) ;
  • Li, Ming-Xi (School of Materials Science and Engineering, Anhui University of Technology)
  • Published : 2007.11.12
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Abstract

The microstructure and micro-hardness of high velocity oxygen fuel-sprayed (HVOF) WC-CoCr coatings are comparatively studied for both before and after laser heat-treatment (LT) of the coatings. The results indicate that compared to HVOF WC-CoCro coating, the laser treatment has eliminated the pores almost entirely providing a more homogeneous and densified microstructure. And the compact interface of the coating with substrate is achieved by laser treatment. The thickness of the coating has decreased from 300 ${\mu}m$ to 225 ${\mu}m$ As a result, the average porosity is five times higher in HVOF coating than in the coating by laser treatment. The laser treatment has produced a considerable increment in the hardness of the coating near surface whose average value increases from Hv0.2=1262.4 in the HVOF-sprayed coating to Hv0.2=1818.7 in the coatings treated with laser.

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